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非平衡桥测量NTC接ADC后引入系统误差

Other Parts Discussed in Thread: ADS1015, REF3020, ADS1115

用ADS1015/ADS1115通过非平衡桥测NTC(热敏电阻),基准电压源选择REF3020,通过测试发现ADC的输入阻抗在10.5--10.6M之间,非平衡桥方式的下端电阻及NTC相当于并联10.5M左右的电阻,导致系统误差。由于体积有限不可能选择跟随器的方式来减小误差,有什么方法把测量误差降低。